003
FNCA52 TJSJ 010853
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
453 AM AST THU JAN 1 2026
DISCUSSION
AN UPPER-LEVEL TROUGH AND ASSOCIATED FRONTAL BOUNDARY WILL RESULT
IN RELATIVE HUMIDITIES TO REMAIN ABOVE THRESHOLD VALUES.
ADDITIONALLY, SHOWER ACTIVITY COULD ALSO DEVELOP TODAY,
PARTICULARLY DURING THE AFTERNOON HOURS OVER INTERIOR TO WSW
PUERTO RICO. ESE WINDS WILL BE AT 10 TO 13 MPH WITH HIGHER GUSTS
ACROSS COASTAL SECTORS. THE FIRE DANGER WILL REMAIN LOW TODAY.
CONTINUE TO MONITOR THE FORECAST FOR ANY UPDATES.
PRZ014-020900-
SOUTHEAST COASTAL PLAINS-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 40
TEMP (24H TREND) 86 (+1) 67 (-4) 86
RH % (24H TREND) 58 (+3) 92 (+2) 55
WIND 20FT/EARLY(MPH) SE 11 NE 8 E 14 G22
WIND 20FT/LATE(MPH) SE 11 NE 8 E 14 G22
MIXING HGT(FT-AGL/MSL)4350 4810
TRANSPORT WND (MPH) E 8 E 16
VENT RATE (KT-FT) 30450 67340
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-020900-
SOUTHERN HILLS-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 50
TEMP (24H TREND) 82 (+2) 64 (-5) 82
RH % (24H TREND) 63 (-4) 97 (+5) 60
WIND 20FT/EARLY(MPH) SE 9 E 6 E 12
WIND 20FT/LATE(MPH) SE 9 E 6 E 12
MIXING HGT(FT-AGL/MSL)4640 4750
TRANSPORT WND (MPH) E 7 E 14
VENT RATE (KT-FT) 27840 57000
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-020900-
NORTH COASTAL PLAINS-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 40
TEMP (24H TREND) 85 (-1) 67 (-3) 85
RH % (24H TREND) 59 (-3) 98 (+1) 59
WIND 20FT/EARLY(MPH) E 13 E 11 E 16 G19
WIND 20FT/LATE(MPH) E 13 E 11 E 16 G19
MIXING HGT(FT-AGL/MSL)4390 4630
TRANSPORT WND (MPH) E 9 E 16
VENT RATE (KT-FT) 35120 64820
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-020900-
NORTHERN HILLS-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 70 60 50
TEMP (24H TREND) 84 (0) 65 (-3) 83
RH % (24H TREND) 62 (0) 98 (+1) 58
WIND 20FT/EARLY(MPH) NE 11 E 9 E 14
WIND 20FT/LATE(MPH) NE 11 E 9 E 14
MIXING HGT(FT-AGL/MSL)4530 5080
TRANSPORT WND (MPH) E 7 E 14
VENT RATE (KT-FT) 27180 60960
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-020900-
WEST COAST-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 40 60
TEMP (24H TREND) 86 (0) 66 (-4) 86
RH % (24H TREND) 63 (-3) 98 (+4) 59
WIND 20FT/EARLY(MPH) E 9 E 11 SE 13
WIND 20FT/LATE(MPH) E 9 E 11 SE 13
MIXING HGT(FT-AGL/MSL)4340 4190
TRANSPORT WND (MPH) E 6 E 15
VENT RATE (KT-FT) 21700 54470
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-020900-
EASTERN INTERIOR-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 50
TEMP (24H TREND) 83 (+1) 65 (-4) 82
RH % (24H TREND) 61 (-3) 98 (+3) 62
WIND 20FT/EARLY(MPH) E 9 E 8 E 12
WIND 20FT/LATE(MPH) E 9 E 8 E 12
MIXING HGT(FT-AGL/MSL)4970 4700
TRANSPORT WND (MPH) E 7 E 14
VENT RATE (KT-FT) 29820 56400
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-020900-
LUQUILLO MOUNTAIN RANGE-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 50
TEMP (24H TREND) 79 (+2) 63 (-4) 79
RH % (24H TREND) 64 (-7) 100 (+2) 66
WIND 20FT/EARLY(MPH) E 8 E 5 E 11
WIND 20FT/LATE(MPH) E 8 E 5 E 11
MIXING HGT(FT-AGL/MSL)4360 4370
TRANSPORT WND (MPH) E 8 E 16
VENT RATE (KT-FT) 30520 61180
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-020900-
CENTRAL MOUNTAIN RANGE-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 40 70
TEMP (24H TREND) 81 (+2) 62 (-5) 81
RH % (24H TREND) 63 (-4) 98 (+2) 59
WIND 20FT/EARLY(MPH) E 5 E 8 E 12
WIND 20FT/LATE(MPH) E 5 E 8 E 12
MIXING HGT(FT-AGL/MSL)4940 5420
TRANSPORT WND (MPH) E 5 E 10
VENT RATE (KT-FT) 19760 48780
DISPERSION 5 5
DSI 4 1 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-020900-
CAYEY MOUNTAIN RANGE-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 50
TEMP (24H TREND) 78 (0) 64 (-3) 77
RH % (24H TREND) 66 (-3) 98 (+1) 67
WIND 20FT/EARLY(MPH) E 6 E 5 E 11
WIND 20FT/LATE(MPH) E 6 E 5 E 11
MIXING HGT(FT-AGL/MSL)4560 4670
TRANSPORT WND (MPH) E 8 E 17
VENT RATE (KT-FT) 31920 70050
DISPERSION 5 5
DSI 5 1 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-020900-
VIEQUES-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 50
TEMP (24H TREND) 85 (0) 70 (-3) 85
RH % (24H TREND) 53 (-5) 89 (+1) 55
WIND 20FT/EARLY(MPH) E 6 E 9 E 13 G17
WIND 20FT/LATE(MPH) E 6 E 9 E 13 G17
MIXING HGT(FT-AGL/MSL)3570 4100
TRANSPORT WND (MPH) E 9 E 9
VENT RATE (KT-FT) 28560 32800
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-020900-
CULEBRA-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER CLEAR MCLEAR PCLDY
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 20 50
TEMP (24H TREND) 85 (0) 72 (-3) 85
RH % (24H TREND) 53 (-8) 84 (0) 57
WIND 20FT/EARLY(MPH) E 6 E 9 E 13 G17
WIND 20FT/LATE(MPH) E 6 E 9 E 13 G17
MIXING HGT(FT-AGL/MSL)3790 3970
TRANSPORT WND (MPH) E 8 E 8
VENT RATE (KT-FT) 26530 27790
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-020900-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30
TEMP (24H TREND) 87 (+2) 67 (-5) 87
RH % (24H TREND) 59 (+3) 93 (+4) 55
WIND 20FT/EARLY(MPH) SE 11 G17 E 10 SE 17 G25
WIND 20FT/LATE(MPH) SE 11 G17 E 10 SE 17 G25
MIXING HGT(FT-AGL/MSL)4510 4670
TRANSPORT WND (MPH) E 9 E 16
VENT RATE (KT-FT) 36080 65380
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-020900-
SAINT THOMAS AND SAINT JOHN-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER CLEAR MCLEAR PCLDY
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 20 40
TEMP (24H TREND) 85 (+1) 70 (-5) 85
RH % (24H TREND) 52 (-13) 89 (+5) 54
WIND 20FT/EARLY(MPH) E 6 E 9 E 13 G17
WIND 20FT/LATE(MPH) E 6 E 9 E 13 G17
MIXING HGT(FT-AGL/MSL)4250 4280
TRANSPORT WND (MPH) E 8 NE 9
VENT RATE (KT-FT) 29750 34240
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-020900-
ST CROIX-
453 AM AST THU JAN 1 2026
TODAY TONIGHT FRI
CLOUD COVER CLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 20 50
TEMP (24H TREND) 86 (+1) 70 (-4) 86
RH % (24H TREND) 54 (-9) 88 (+4) 56
WIND 20FT/EARLY(MPH) E 8 E 10 E 12
WIND 20FT/LATE(MPH) E 8 E 10 E 12
MIXING HGT(FT-AGL/MSL)4940 5230
TRANSPORT WND (MPH) E 8 E 15
VENT RATE (KT-FT) 34580 67990
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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